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03002V-90(D)
MODEL 03002V
WIND SENTRY
(WITH 0-1 VDC OUTPUT)
INCLUDES MODELS 03102V & 03302V
INTRODUCTION
The Wind Sentry Anemometer and Vane measure horizontal wind
speed and wind direction. The small size, simplicity, and corrosion
resistant construction provide a professional quality instrument at
a modest cost. The cup wheel and vane shafts use stainless steel
precision instrument grade ball bearings which are lubricated with
a wide temperature range high quality instrument oil. Standard
bearings have light contacting seals to exclude contamination and
help retain lubricant for longer service life.
Cup wheel rotation produces an AC sine wave voltage signal with
frequency proportional to wind speed. Internal circuitry converts
the raw signal to a linear voltage output.
Vane position is sensed by a 10K ohm precision conductive plastic
potentiometer. This signal is also converted to a linear voltage output.
The sensor mounts on standard 1 inch pipe, outside diameter
34 mm (1.34") and is supplied with a cross arm and junction box
for cable connections. Wind Sentry anemometers and wind vanes
are available separately with similar mounting and junction box.
INITIAL CHECK-OUT
When the Wind Sentry is unpacked, check it carefully for any signs
of shipping damage.
Place the cup wheel on the anemometer shaft and secure it by
tightening the set screw on the side of the hub. The instrument is
aligned, balanced, and fully calibrated before shipment; however,
it should be checked both mechanically and electrically before
installation. The vane and cup wheel should easily rotate 360°
without friction. Check vane balance by holding the instrument so
the vane surface is horizontal. It should have near-neutral torque
without any particular tendency to rotate. A slight imbalance will
not degrade performance.
INSTALLATION
Proper placement of the instrument is very important. Eddies from trees,
buildings, or other structures can greatly influence wind speed and
direction observations. To get meaningful data for most applications,
locate the instrument well above or upwind of such obstructions. As a
general rule, the air flow around a structure is disturbed to twice the
height of the structure upwind, six times the height downwind, and
twice the height of the structure above ground. For some applications
it may not be practical or necessary to meet these requirements.
Grounding the Wind Sentry is vitally important. Without proper
grounding, static electrical charge can build up during certain
atmospheric conditions and discharge through the transducers. This
discharge may cause erroneous signals or transducer failure. To
direct the discharge away from the transducers, housings in which the
transducers are mounted are made with a special anti-static plastic.
It is important that the mounting post be connected to a good earth
ground. There are two ways this may be accomplished. First, the
Wind Sentry may be mounted on a metal pipe which is connected
to earth ground. The mounting pipe should not be painted where the
Wind Sentry is mounted. Towers or masts set in concrete should be
connected to one or more grounding rods. If it is difficult to ground the
mounting post in this manner, the following method should be used.
Inside the junction box the screw labeled EARTH GND is connected
to the anti-static housings. This terminal should be connected to an
earth ground (Refer to wiring diagram).
WIND SPEED SPECIFICATION SUMMARY
Range
0 to 50 m/s (112 mph)
Gust Survival 60 m/s (134 mph)
Sensor
12 cm diameter cup wheel assembly
40 mm diameter hemispherical cups
Turning Factor
75 cm (2.46 ft)
Distance Constant
2.3 m (7.5 ft.) for 63% recovery
Threshold Sensitivity 1.1 m/s (2.5 mph)
Transducer
Stationary coil, 1300 Ohm nominal DC
resistance
Output Signal
0-1 VDC = 0-50 m/s
WIND DIRECTION (AZIMUTH) SPECIFICATION SUMMARY
Range
360° mechanical, 352° electrical (8° open)
Sensor
Balanced vane, 16 cm (6.3 in) turning rad.
Damping Ratio
0.2
Delay Distance
0.5 m (1.6 ft) for 50% recovery
Threshold Sensitivity 1.3 m/s (2.9 mph) at 10° displacement
1.9 m/s (4.2 mph) at 5° displacement
Transducer
Precision conductive plastic potentiometer,
10K ohm resistance (±20%),
1.0% linearity, life expectancy 50 million
revolutions, rated 1 watt at 40°C,
0 watts at 125°C
Output Signal
0-1 VDC = 0 to 360°
GENERAL
Power Requirement:
8 - 24 VDC (5mA @ 12 VDC)
Operating Temperature: -50 to 50°C (-58 to 122°F)